13. You are conducting a study to see if students do better when they study all at
once or in intervals. One group of 12 participants took a test after studying for
one hour continuously. The other group of 12 participants took a test after
studying for three twenty minute sessions. The first group had a mean score of
75 and a variance of 120. The second group had a mean score of 86 and a
variance of 100.
a. What is the calculated t value? Are the mean test scores of these two groups
significantly different at the .05 level?
b. What would the t value be if there were only 6 participants in each group?
Would the scores be significant at the .05 level?